IP Classes

IP Classes

April 09, 2026


0

128

192

224

240


  1. Address 192.5.48.3 belongs to Class C.
  2. In IP addressing scheme, class used for multicasting is Class D
  3. Network address prefixed by 1110 is a  Multicast address.
  4. A network address prefixed by 1000 is Class B.
  5. IP V4 have 32 bit and IP V6 have 128 bits.
  6. Which class of IP address has the most host address avaibility by default? 192 to 223
  7. If a class B network on the Internet has a subnet mask of 255.255.252.0 then what is the maximum number of host per subnet?1022
  8. What is the maximum number of IP address can be assigned to host on a local subnet that uses the 255.255.255.224 subnet mask?30
  9. If subnet mask 255.255.255.224, which of the following will be direct bradcast address? 202.15.19.127 & 202.15.19.63
  10. If the range of first octet is 240-254 then IP address belongs to which of the follwing class? CLASS E.

100 MCQs on IP Addressing & Classes

🔹 BASIC CONCEPT

  1. IP stands for ...Internet Protocol...

  2. IP address is used to identify ...Devices on network...

  3. IPv4 address size is ...32 bits...

  4. IPv6 address size is ...128 bits...

  5. IPv4 is written in ...Decimal format...

  6. IPv6 is written in ...Hexadecimal format...

  7. IP address consists of ...Network ID and Host ID...

  8. Total octets in IPv4 are ...4...

  9. Each octet has ...8 bits...

  10. Total bits in IPv4 = ...32 bits...

🔹 CLASSES

  1. Number of IP classes = ...5...

  2. Class A range starts from ...1...

  3. Class A range ends at ...126...

  4. Class B range starts from ...128...

  5. Class B range ends at ...191...

  6. Class C range starts from ...192...

  7. Class C range ends at ...223...

  8. Class D range starts from ...224...

  9. Class D range ends at ...239...

  10. Class E range starts from ...240...

  1. Class A default subnet mask = ...255.0.0.0...

  2. Class B default subnet mask = ...255.255.0.0...

  3. Class C default subnet mask = ...255.255.255.0...

  4. Class A format = ...N.H.H.H...

  5. Class B format = ...N.N.H.H...

  6. Class C format = ...N.N.N.H...

🔹 IDENTIFICATION

  1. 10.0.0.1 belongs to ...Class A...

  2. 172.16.0.1 belongs to ...Class B...

  3. 192.168.1.1 belongs to ...Class C...

  4. 225.1.1.1 belongs to ...Class D...

  5. 245.1.1.1 belongs to ...Class E...

  1. First octet 50 → class ...A...

  2. First octet 150 → class ...B...

  3. First octet 200 → class ...C...

  4. First octet 230 → class ...D...

  5. First octet 250 → class ...E...

🔹 PRIVATE IP

  1. Private Class A range = ...10.0.0.0 – 10.255.255.255...

  2. Private Class B range = ...172.16.0.0 – 172.31.255.255...

  3. Private Class C range = ...192.168.0.0 – 192.168.255.255...

  4. Private IPs are used in ...Local networks...

  5. Private IPs are not routable on ...Internet...

🔹 SPECIAL ADDRESSES

  1. 127.0.0.1 is ...Loopback address...

  2. 0.0.0.0 means ...Unknown address...

  3. 255.255.255.255 is ...Broadcast address...

  4. Loopback belongs to ...Class A...

  5. Broadcast is used to send data to ...All devices...

🔹 HOST & NETWORK

  1. Network ID identifies ...Network...

  2. Host ID identifies ...Device...

  3. Class A has ...8 network bits...

  4. Class A has ...24 host bits...

  1. Class B has ...16 network bits...

  2. Class B has ...16 host bits...

  3. Class C has ...24 network bits...

  4. Class C has ...8 host bits...

🔹 CALCULATIONS

  1. Max hosts in Class A = ...2^24 – 2...

  2. Max hosts in Class B = ...2^16 – 2...

  3. Max hosts in Class C = ...2^8 – 2...

  1. Max hosts in Class C = ...254...

  2. Max hosts in Class B = ...65534...

  3. Max hosts in Class A = ...16777214...

🔹 BINARY CONCEPT

  1. IPv4 is based on ...Binary system...

  2. Each bit is either ...0 or 1...

  3. Decimal 255 in binary = ...11111111...

  4. Decimal 0 in binary = ...00000000...

  5. 192 in binary starts with ...110...

🔹 CLASS PREFIX

  1. Class A starts with bits ...0...

  2. Class B starts with bits ...10...

  3. Class C starts with bits ...110...

  4. Class D starts with bits ...1110...

  5. Class E starts with bits ...1111...

🔹 PRACTICAL

  1. 11.1.1.1 is ...Class A...

  2. 130.1.1.1 is ...Class B...

  3. 200.1.1.1 is ...Class C...

  4. 224.0.0.5 is ...Class D...

  5. 250.10.10.10 is ...Class E...

🔹 NETWORK TYPES

  1. Class A used for ...Large networks...

  2. Class B used for ...Medium networks...

  3. Class C used for ...Small networks...

  4. Class D used for ...Multicast...

  5. Class E used for ...Research...

🔹 TRICKY

  1. Class A does not include ...127...

  2. 127 is reserved for ...Loopback...

  3. First usable host excludes ...Network & Broadcast...

  4. Last usable host excludes ...Broadcast...

  5. Total usable hosts formula = ...2^n – 2...

🔹 MIXED

  1. Which class supports multicast? ...Class D...

  2. Which class is experimental? ...Class E...

  3. Which class has largest hosts? ...Class A...

  4. Which class has smallest hosts? ...Class C...

  5. Which class is most used in LAN? ...Class C...

🔹 CONCEPTUAL

  1. IP address must be ...Unique...

  2. Duplicate IP causes ...Conflict...

  3. Public IP is used on ...Internet...

  4. Private IP is used on ...LAN...

  5. NAT converts ...Private IP to Public IP...

🔹 FINAL

  1. IP helps in ...Routing...

  2. IP works at ...Network Layer...

  3. IP provides ...Logical addressing...

  4. IP is ...Connectionless protocol...

  5. IP does not guarantee ...Delivery...


Nice 😏 now I’ll give you mixed MCQs (concept + tricky + numerical + scenario) on IP Addressing & Classes — exactly like exams.

🌐 Mixed MCQs on IP Addressing & Classes

🔹 1

Which of the following is a valid IPv4 address?
A. 256.10.10.1
B. 192.168.1.1
C. 300.1.1.1
D. 192.168.1.256
👉 Answer: B

🔹 2

Which class does IP 150.10.20.30 belong to?
A. Class A
B. Class B
C. Class C
D. Class D
👉 Answer: B

🔹 3

Which IP is private?
A. 8.8.8.8
B. 172.20.10.5
C. 200.1.1.1
D. 150.1.1.1
👉 Answer: B

🔹 4

How many bits are in IPv4?
A. 16
B. 32
C. 64
D. 128
👉 Answer: B

🔹 5

Which class has default subnet mask 255.255.255.0?
A. Class A
B. Class B
C. Class C
D. Class D
👉 Answer: C

🔹 6

Which of the following is a loopback address?
A. 0.0.0.0
B. 127.0.0.1
C. 255.255.255.255
D. 192.168.1.1
👉 Answer: B

🔹 7

Which class is used for multicast?
A. A
B. B
C. C
D. D
👉 Answer: D

🔹 8

What is the range of Class C?
A. 1–126
B. 128–191
C. 192–223
D. 224–239
👉 Answer: C

🔹 9

Which IP is invalid?
A. 192.168.1.1
B. 10.0.0.256
C. 172.16.0.1
D. 8.8.8.8
👉 Answer: B

🔹 10

Which part identifies device in IP?
A. Network ID
B. Host ID
C. Port
D. Protocol
👉 Answer: B

🔹 11

Which class has largest number of hosts?
A. A
B. B
C. C
D. D
👉 Answer: A

🔹 12

Which of the following is public IP?
A. 192.168.1.1
B. 10.1.1.1
C. 8.8.8.8
D. 172.16.1.1
👉 Answer: C

🔹 13

Which class does 200.1.1.1 belong to?
A. A
B. B
C. C
D. D
👉 Answer: C

🔹 14

Maximum hosts in Class C network?
A. 126
B. 254
C. 65534
D. 16777214
👉 Answer: B

🔹 15

Which IP is broadcast?
A. 0.0.0.0
B. 127.0.0.1
C. 255.255.255.255
D. 192.168.1.1
👉 Answer: C

🔹 16

Which class starts with binary 110?
A. A
B. B
C. C
D. D
👉 Answer: C

🔹 17

Which IP belongs to Class A?
A. 11.0.0.1
B. 130.1.1.1
C. 192.1.1.1
D. 224.1.1.1
👉 Answer: A

🔹 18

Private Class B range is?
A. 10.0.0.0 – 10.255.255.255
B. 172.16.0.0 – 172.31.255.255
C. 192.168.0.0 – 192.168.255.255
D. 8.0.0.0 – 8.255.255.255
👉 Answer: B

🔹 19

Which layer does IP work on?
A. Transport
B. Network
C. Data Link
D. Physical
👉 Answer: B

🔹 20

Which IP is Class D?
A. 210.1.1.1
B. 230.1.1.1
C. 180.1.1.1
D. 120.1.1.1
👉 Answer: B

🔹 21

Which is not a valid IP?
A. 192.168.1.1
B. 10.10.10
C. 8.8.8.8
D. 172.16.0.1
👉 Answer: B

🔹 22

How many octets in IPv4?
A. 2
B. 4
C. 6
D. 8
👉 Answer: B

🔹 23

Which is reserved for research?
A. Class D
B. Class C
C. Class E
D. Class B
👉 Answer: C

🔹 24

Which IP is Class B?
A. 100.1.1.1
B. 150.1.1.1
C. 200.1.1.1
D. 230.1.1.1
👉 Answer: B

🔹 25

Which IP is private Class C?
A. 192.168.1.1
B. 200.1.1.1
C. 150.1.1.1
D. 8.8.8.8
👉 Answer: A

🔹 26

Binary of 255 is?
A. 00000000
B. 11111111
C. 10101010
D. 11001100
👉 Answer: B

🔹 27

Which class uses N.N.H.H format?
A. A
B. B
C. C
D. D
👉 Answer: B

🔹 28

Which is default mask of Class B?
A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.255
👉 Answer: B

🔹 29

Which class supports multicast?
A. A
B. B
C. C
D. D
👉 Answer: D

🔹 30

Which is correct host formula?
A. 2ⁿ
B. 2ⁿ − 2
C. n²
D. n − 2
👉 Answer: B

Perfect 😈 now we enter REAL networking zone → Subnetting MCQs (mixed + tricky + numerical)

💀 Subnetting MCQs (Mixed + Exam Level)

🔹 1

What is subnetting?
A. Combining networks
B. Dividing network into smaller networks
C. Increasing bandwidth
D. Encrypting data
👉 Answer: B

🔹 2

Which is default mask of Class C?
A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.255
👉 Answer: C

🔹 3

How many subnets are created with 2 borrowed bits?
A. 2
B. 4
C. 6
D. 8
👉 Answer: B (2² = 4)

🔹 4

How many hosts per subnet with 3 host bits?
A. 6
B. 8
C. 14
D. 30
👉 Answer: A (2³ − 2 = 6)

🔹 5

What is subnet mask for /26?
A. 255.255.255.0
B. 255.255.255.128
C. 255.255.255.192
D. 255.255.255.224
👉 Answer: C

🔹 6

What is subnet mask for /27?
A. 255.255.255.224
B. 255.255.255.240
C. 255.255.255.248
D. 255.255.255.192
👉 Answer: A

🔹 7

Number of hosts in /24?
A. 128
B. 254
C. 256
D. 512
👉 Answer: B

🔹 8

Number of hosts in /25?
A. 126
B. 128
C. 254
D. 62
👉 Answer: A

🔹 9

Number of hosts in /26?
A. 62
B. 64
C. 126
D. 30
👉 Answer: A

🔹 10

Number of hosts in /27?
A. 30
B. 32
C. 62
D. 14
👉 Answer: A

🔹 11

What is block size of /26?
A. 32
B. 64
C. 128
D. 16
👉 Answer: B

🔹 12

What is block size of /27?
A. 16
B. 32
C. 64
D. 128
👉 Answer: B

🔹 13

What is block size of /28?
A. 8
B. 16
C. 32
D. 64
👉 Answer: B

🔹 14

Find network address of 192.168.1.10/24
A. 192.168.1.0
B. 192.168.1.255
C. 192.168.1.10
D. 192.168.0.0
👉 Answer: A

🔹 15

Find broadcast of 192.168.1.10/24
A. 192.168.1.0
B. 192.168.1.255
C. 192.168.1.10
D. 192.168.0.255
👉 Answer: B

🔹 16

Find network address of 192.168.1.130/25
A. 192.168.1.0
B. 192.168.1.128
C. 192.168.1.255
D. 192.168.1.64
👉 Answer: B

🔹 17

Broadcast of above?
A. 192.168.1.127
B. 192.168.1.191
C. 192.168.1.255
D. 192.168.1.128
👉 Answer: C

🔹 18

Which is first usable IP in 192.168.1.0/24?
A. 192.168.1.0
B. 192.168.1.1
C. 192.168.1.255
D. 192.168.1.2
👉 Answer: B

🔹 19

Which is last usable IP?
A. 192.168.1.254
B. 192.168.1.255
C. 192.168.1.253
D. 192.168.1.1
👉 Answer: A

🔹 20

How many subnets in /26 from /24?
A. 2
B. 4
C. 8
D. 16
👉 Answer: B

🔹 21

Subnet mask of /28?
A. 255.255.255.240
B. 255.255.255.224
C. 255.255.255.248
D. 255.255.255.192
👉 Answer: A

🔹 22

Hosts in /28?
A. 14
B. 16
C. 30
D. 62
👉 Answer: A

🔹 23

Find network of 10.0.5.130/16
A. 10.0.0.0
B. 10.0.5.0
C. 10.0.255.255
D. 10.5.0.0
👉 Answer: A

🔹 24

Which mask gives 30 hosts?
A. /26
B. /27
C. /28
D. /25
👉 Answer: B

🔹 25

Which mask gives 14 hosts?
A. /27
B. /28
C. /29
D. /26
👉 Answer: B

🔹 26

Which mask gives 6 hosts?
A. /29
B. /28
C. /27
D. /30
👉 Answer: A

🔹 27

Which mask gives 2 hosts?
A. /30
B. /29
C. /28
D. /31
👉 Answer: A

🔹 28

What is block size of /29?
A. 8
B. 16
C. 32
D. 64
👉 Answer: A

🔹 29

Find network of 192.168.1.70/26
A. 192.168.1.0
B. 192.168.1.64
C. 192.168.1.128
D. 192.168.1.192
👉 Answer: B

🔹 30

Broadcast of above?
A. 192.168.1.63
B. 192.168.1.127
C. 192.168.1.191
D. 192.168.1.255
👉 Answer: B


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ASI Suman Adhikari

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